题文
Mary went to the box office at lunch time, but all the tickets __________ out.
| A．would sell |
| B．had sold |
| C．have sold |
| D．was selling |
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Mary went to the box office at lunch time, but all the tickets __________ out.
| A．would sell |
| B．had sold |
| C．have sold |
| D．was selling |
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